Her husband is away on a business trip. Aki is the head of the household, but she is dedicated to taking care of the house and raising her child. But when her son, a student, brings over a friend for the first time, Aki's dormant sexual desire is ignited... Even though she knows it's wrong, her body tempts her on its own, and she instinctively begs for his sperm, eventually becoming a woman and sinking into the swamp of lust...